As we've reported, Justin Bieber was pretty worked up over his celebrations planned for this weekend going awry when security at the venue for his party, London's Cirque Du Soir, refused to admit his underage friends like Jaden Smith, ultimately prompting he and his entire entourage to leave early!

And while the pop sensation has remained out of the public eye for the majority of the weekend, he managed to take a deep breath and perform his latest Believe Tour concert stop at Capital FM Arena in Nottingham, before putting on a smile for his fans and heading back to his hotel!

Ch-ch-check 'em out (above and below)!

Later on, he even took the time to thank all his fans via Twitter for what we assume were condolences for his failed extravaganza:

I see and saw all the posts from around the world. U got me smiling. Love u. Thank u. #beliebers

You're not the first person to have a birthday party go poorly, but we think it's pretty safe to assume that you're one of the few who is lucky enough to have millions of teenage girls sharing your case of the sadsies, and sending you support in 140 characters or less!

What a muppet! If he had any talent he would be having mix audience of 50% males (like any normal talented musician has). Since 100% of his audience consists of ONLY girls it is safe to say nobody comes to see him for his musical talent (which obviously is not strong by its own).

Perez what is your problem? Why are you shining light on this kid that is headed for the Lohan highway. He had the worst Birthday ever because he and his friend are awful and don't know how to act. You shouldn't praise him it's just contributing to the madness.

hi,justin love you very-very much and you is very cool boy in a world !!! happy birthday!!! i wish you a long life!!! i am your fun number #1!! please find me and my friends tooo!!! we all love you!!!! only you!!! we are from of tajikiston!!!! winh love MuTI-1404!!!

Lol? Why the hell was Will Smith letting his 14-year old son go to a night club anyways? Does the Fresh Prince just not care that if security had let him in, he would've probably gotten smashed with Justin in a foreign country? Good god, and I thought you'd be a parent more akin to Uncle Phil.

We actually wondered if Justin would have toooo good a birthday celebration and be too hung over to perform at Nottingham. My daughter was in tears (only 9), as Justin was so late coming on stage. We thought he was going to cancel at the last minute. Supposed to be 9pm appearance, instead nearly 9.45!! We were not told if he had problems or if it was technical. Worth the wait though-amazing night.